Capacitors in DC - Question

Discussion in 'Electronics Resources' started by krow, Mar 2, 2011.

  1. krow

    Thread Starter Member

    May 25, 2010
    This might be a stupid question but I'm still trying to find a clear answer in books and I can't find any, or maybe I just don't get it.

    Having capacitors in a DC circuit basically means infinite resistance or 0 current, right? then why would we need capacitors in a DC circuit? I know they can story charge from a battery and then release it but the question is, what do we need that for?

    In other words, what's the function of a capacitor in a DC circuit?
  2. bertus


    Apr 5, 2008
  3. someonesdad

    Senior Member

    Jul 7, 2009
    Another use, because they can store charge, is to provide power to a micropower or nanopower circuit. For example, a PIC demo board from Microchip comes with a small supercapacitor to let the user explore this feature.
  4. miguel cool

    New Member

    Mar 15, 2010
    One example is a DC-DC converter, it has a double function, filter and energy storage.

    And a capacitor in DC doesn't have infinite resistancie. It's called isolation resistance and it is betwen 1Mohs to 100MOhms, this implies a very low current called leakage current.